Portable power supply



FIG. 1 is a front view of a portable power supply showing my new design;

FIG. 2 is a front and right side perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right side view thereof, the left side view thereof being amirror image except for the color of the cable and clamp;

FIG. 5 is a front view thereof showing one cable clamp removed from itsstorage position;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a bottom view thereof.

The ornamental design for a portable power supply, as shown anddescribed.